gistfile1.txt

diff --git a/cfg.c b/cfg.c
index 84db9fb3..fb95f89e 100644
--- a/cfg.c
+++ b/cfg.c
@@ -77,6 +77,12 @@ set_cfg_file(const char *path)
        cfg_file = xstrdup(path);
 }
 
+const char *
+get_cfg_file(void)
+{
+       return (cfg_file);
+}
+
 void
 start_cfg(void)
 {
diff --git a/format.c b/format.c
index 1a3ba762..f5f78a88 100644
--- a/format.c
+++ b/format.c
@@ -759,6 +759,7 @@ format_create(struct client *c, struct cmdq_item *item, int tag, int flags)
        format_add_cb(ft, "pid", format_cb_pid);
        format_add(ft, "socket_path", "%s", socket_path);
        format_add_tv(ft, "start_time", &start_time);
+       format_add(ft, "config_file", "%s", get_cfg_file());
 
        for (wm = all_window_modes; *wm != NULL; wm++) {
                if ((*wm)->default_format != NULL) {
diff --git a/tmux.h b/tmux.h
index 9487e4ad..f2b8c6ee 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1597,6 +1597,7 @@ extern struct client *cfg_client;
 void   start_cfg(void);
 int    load_cfg(const char *, struct client *, struct cmdq_item *, int);
 void   set_cfg_file(const char *);
+const char     *get_cfg_file(void);
 void printflike(1, 2) cfg_add_cause(const char *, ...);
 void   cfg_print_causes(struct cmdq_item *);
 void   cfg_show_causes(struct session *);